Lifting column



FIG. 1 is a top, left, front perspective view of a lifting column showing my new design in a retracted state;

FIG. 2 is a bottom, left, rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a top, left, front perspective view of a lifting column showing my new design in an extended state;

FIG. 10 is a bottom, left, rear perspective view thereof;

FIG. 11 is a front elevation view thereof;

FIG. 12 is a rear elevation view thereof;

FIG. 13 is a left side elevation view thereof;

FIG. 14 is a right side elevation view thereof;

FIG. 15 is a top plan view thereof; and,

FIG. 16 is a bottom plan view thereof. 

CLAIM The ornamental design for a lifting column, as shown and described. 